I started sweating while eating spicy food about the time I turned 50. It was my only indicator if something would be hot to other people, but that was way before I had cancer. I have noticed several foods make me sweat now, but have not seen any pattern to it.
My worst reaction to peppers has been the side of my tongue, that the radiation burned off. That is slowly getting better, 5 months out.
And I say if you can tollerate it, eat the spicy stuff. We deserve some pleasure.